(*  Title:      Tools/Code/code_target.ML

    Author:     Florian Haftmann, TU Muenchen

Generic infrastructure for target language data.

*)

signature CODE_TARGET =

sig

  val cert_tyco: theory -> string -> string

  val read_tyco: theory -> string -> string

  val read_const_exprs: theory -> string list -> string list

  val export_code_for: theory -> Path.T option -> string -> int option -> string -> Token.T list

    -> Code_Thingol.naming -> Code_Thingol.program -> string list -> unit

  val produce_code_for: theory -> string -> int option -> string -> Token.T list

    -> Code_Thingol.naming -> Code_Thingol.program -> string list -> (string * string) list * string option list

  val present_code_for: theory -> string -> int option -> string -> Token.T list

    -> Code_Thingol.naming -> Code_Thingol.program -> string list * string list -> string

  val check_code_for: theory -> string -> bool -> Token.T list

    -> Code_Thingol.naming -> Code_Thingol.program -> string list -> unit

  val export_code: theory -> string list

    -> (((string * string) * Path.T option) * Token.T list) list -> unit

  val produce_code: theory -> string list

    -> string -> int option -> string -> Token.T list -> (string * string) list * string option list

  val present_code: theory -> string list -> (Code_Thingol.naming -> string list)

    -> string -> int option -> string -> Token.T list -> string

  val check_code: theory -> string list

    -> ((string * bool) * Token.T list) list -> unit

  val generatedN: string

  val evaluator: theory -> string -> Code_Thingol.naming -> Code_Thingol.program

    -> string list -> ((string * class list) list * Code_Thingol.itype) * Code_Thingol.iterm

    -> (string * string) list * string

  type serializer

  type literals = Code_Printer.literals

  val add_target: string * { serializer: serializer, literals: literals,

    check: { env_var: string, make_destination: Path.T -> Path.T, make_command: string -> string } }

    -> theory -> theory

  val extend_target: string *

      (string * (Code_Thingol.naming -> Code_Thingol.program -> Code_Thingol.program))

    -> theory -> theory

  val assert_target: theory -> string -> string

  val the_literals: theory -> string -> literals

  type serialization

  val parse_args: 'a parser -> Token.T list -> 'a

  val serialization: (int -> Path.T option -> 'a -> unit)

    -> (string list -> int -> 'a -> (string * string) list * (string -> string option))

    -> 'a -> serialization

  val set_default_code_width: int -> theory -> theory

  type ('a, 'b, 'c, 'd, 'e, 'f) symbol_attr_decl

  type const_syntax = Code_Printer.const_syntax

  type tyco_syntax = Code_Printer.tyco_syntax

  val set_printings: (const_syntax, tyco_syntax, string, unit, unit, (string * string list)) symbol_attr_decl

    -> theory -> theory

  val add_const_syntax: string -> string -> const_syntax option -> theory -> theory

  val add_tyco_syntax: string -> string -> tyco_syntax option -> theory -> theory

  val add_class_syntax: string -> class -> string option -> theory -> theory

  val add_instance_syntax: string -> class * string -> unit option -> theory -> theory

  val add_reserved: string -> string -> theory -> theory

  val add_include: string -> string * (string * string list) option -> theory -> theory

  val allow_abort: string -> theory -> theory

  val codegen_tool: string (*theory name*) -> string (*export_code expr*) -> unit

  val setup: theory -> theory

end;

structure Code_Target : CODE_TARGET =

struct

open Basic_Code_Thingol;

type literals = Code_Printer.literals;

type ('a, 'b, 'c, 'd, 'e, 'f) symbol_attr_decl =

  (string * (string * 'a option) list, string * (string * 'b option) list,

    class * (string * 'c option) list, (class * class) * (string * 'd option) list,

    (class * string) * (string * 'e option) list,

    string * (string * 'f option) list) Code_Symbol.attr;

type tyco_syntax = Code_Printer.tyco_syntax;

type const_syntax = Code_Printer.const_syntax;

(** serializations and serializer **)

(* serialization: abstract nonsense to cover different destinies for generated code *)

datatype destination = Export of Path.T option | Produce | Present of string list;

type serialization = int -> destination -> ((string * string) list * (string -> string option)) option;

fun serialization output _ content width (Export some_path) =

      (output width some_path content; NONE)

  | serialization _ string content width Produce =

      string [] width content |> SOME

  | serialization _ string content width (Present stmt_names) =

     string stmt_names width content

     |> (apfst o map o apsnd) (Pretty.output (SOME width) o Pretty.str)

     |> SOME;

fun export some_path f = (f (Export some_path); ());

fun produce f = the (f Produce);

fun present stmt_names f = space_implode "\n\n" (map snd (fst (the (f (Present stmt_names)))));

(* serializers: functions producing serializations *)

type serializer = Token.T list

  -> {

    labelled_name: string -> string,

    reserved_syms: string list,

    includes: (string * Pretty.T) list,

    module_alias: string -> string option,

    class_syntax: string -> string option,

    tyco_syntax: string -> Code_Printer.tyco_syntax option,

    const_syntax: string -> Code_Printer.activated_const_syntax option }

  -> Code_Thingol.program

  -> serialization;

datatype description =

    Fundamental of { serializer: serializer,

      literals: literals,

      check: { env_var: string, make_destination: Path.T -> Path.T,

        make_command: string -> string } }

  | Extension of string *

      (Code_Thingol.naming -> Code_Thingol.program -> Code_Thingol.program);

(** theory data **)

datatype target = Target of {

  serial: serial,

  description: description,

  reserved: string list,

  module_alias: string Symtab.table,

  printings: (Code_Printer.const_syntax, Code_Printer.tyco_syntax, string, unit, unit,

    (Pretty.T * string list)) Code_Symbol.data

};

fun make_target ((serial, description), ((reserved, module_alias), printings)) =

  Target { serial = serial, description = description, reserved = reserved,

    module_alias = module_alias, printings = printings };

fun map_target f ( Target { serial, description, reserved, module_alias, printings } ) =

  make_target (f ((serial, description), ((reserved, module_alias), printings)));

fun merge_target strict target (Target { serial = serial1, description = description,

  reserved = reserved1, module_alias = module_alias1, printings = printings1 },

    Target { serial = serial2, description = _,

      reserved = reserved2, module_alias = module_alias2, printings = printings2 }) =

  if serial1 = serial2 orelse not strict then

    make_target ((serial1, description),

      ((merge (op =) (reserved1, reserved2),

         Symtab.join (K snd) (module_alias1, module_alias2)),

        (Code_Symbol.merge_data (printings1, printings2))

    ))

  else

    error ("Incompatible targets: " ^ quote target);

fun the_description (Target { description, ... }) = description;

fun the_reserved (Target { reserved, ... }) = reserved;

fun the_module_alias (Target { module_alias , ... }) = module_alias;

fun the_printings (Target { printings, ... }) = printings;

structure Targets = Theory_Data

(

  type T = (target Symtab.table * string list) * int;

  val empty = ((Symtab.empty, []), 80);

  val extend = I;

  fun merge (((target1, exc1), width1), ((target2, exc2), width2)) : T =

    ((Symtab.join (merge_target true) (target1, target2),

      Library.merge (op =) (exc1, exc2)), Int.max (width1, width2));

);

val abort_allowed = snd o fst o Targets.get;

fun assert_target thy target = if Symtab.defined ((fst o fst) (Targets.get thy)) target

  then target

  else error ("Unknown code target language: " ^ quote target);

fun put_target (target, seri) thy =

  let

    val lookup_target = Symtab.lookup ((fst o fst) (Targets.get thy));

    val _ = case seri

     of Extension (super, _) => if is_some (lookup_target super) then ()

          else error ("Unknown code target language: " ^ quote super)

      | _ => ();

    val overwriting = case (Option.map the_description o lookup_target) target

     of NONE => false

      | SOME (Extension _) => true

      | SOME (Fundamental _) => (case seri

         of Extension _ => error ("Will not overwrite existing target " ^ quote target)

          | _ => true);

    val _ = if overwriting

      then warning ("Overwriting existing target " ^ quote target)

      else ();

  in

    thy

    |> (Targets.map o apfst o apfst o Symtab.update)

          (target, make_target ((serial (), seri), (([], Symtab.empty),

            Code_Symbol.empty_data)))

  end;

fun add_target (target, seri) = put_target (target, Fundamental seri);

fun extend_target (target, (super, modify)) =

  put_target (target, Extension (super, modify));

fun map_target_data target f thy =

  let

    val _ = assert_target thy target;

  in

    thy

    |> (Targets.map o apfst o apfst o Symtab.map_entry target o map_target) f

  end;

fun map_reserved target =

  map_target_data target o apsnd o apfst o apfst;

fun map_module_alias target =

  map_target_data target o apsnd o apfst o apsnd;

fun map_printings target =

  map_target_data target o apsnd o apsnd;

fun set_default_code_width k = (Targets.map o apsnd) (K k);

(** serializer usage **)

(* montage *)

fun the_fundamental thy =

  let

    val ((targets, _), _) = Targets.get thy;

    fun fundamental target = case Symtab.lookup targets target

     of SOME data => (case the_description data

         of Fundamental data => data

          | Extension (super, _) => fundamental super)

      | NONE => error ("Unknown code target language: " ^ quote target);

  in fundamental end;

fun the_literals thy = #literals o the_fundamental thy;

fun collapse_hierarchy thy =

  let

    val ((targets, _), _) = Targets.get thy;

    fun collapse target =

      let

        val data = case Symtab.lookup targets target

         of SOME data => data

          | NONE => error ("Unknown code target language: " ^ quote target);

      in case the_description data

       of Fundamental _ => (K I, data)

        | Extension (super, modify) => let

            val (modify', data') = collapse super

          in (fn naming => modify' naming #> modify naming, merge_target false target (data', data)) end

      end;

  in collapse end;

local

fun activate_target thy target =

  let

    val ((_, abortable), default_width) = Targets.get thy;

    val (modify, data) = collapse_hierarchy thy target;

  in (default_width, abortable, data, modify) end;

fun activate_const_syntax thy literals cs_data naming =

  (Symtab.empty, naming)

  |> fold_map (fn (c, data) => fn (tab, naming) =>

      case Code_Thingol.lookup_const naming c

       of SOME name => let

              val (syn, naming') =

                Code_Printer.activate_const_syntax thy literals c data naming

            in (SOME name, (Symtab.update_new (name, syn) tab, naming')) end

        | NONE => (NONE, (tab, naming))) cs_data

  |>> map_filter I;

fun activate_syntax lookup_name things =

  Symtab.empty

  |> fold_map (fn (thing_identifier, data) => fn tab => case lookup_name thing_identifier

       of SOME name => (SOME name, Symtab.update_new (name, data) tab)

        | NONE => (NONE, tab)) things

  |>> map_filter I;

fun activate_symbol_syntax thy literals naming printings =

  let

    val (names_const, (const_syntax, _)) =

      activate_const_syntax thy literals (Code_Symbol.dest_constant_data printings) naming;

    val (names_tyco, tyco_syntax) =

      activate_syntax (Code_Thingol.lookup_tyco naming) (Code_Symbol.dest_type_constructor_data printings);

    val (names_class, class_syntax) =

      activate_syntax (Code_Thingol.lookup_class naming) (Code_Symbol.dest_type_class_data printings);

    val names_inst = map_filter (Code_Thingol.lookup_instance naming o fst)

      (Code_Symbol.dest_class_instance_data printings);

  in

    (names_const @ names_tyco @ names_class @ names_inst,

      (const_syntax, tyco_syntax, class_syntax))

  end;

fun project_program thy abortable names_hidden names1 program2 =

  let

    val ctxt = Proof_Context.init_global thy;

    val names2 = subtract (op =) names_hidden names1;

    val program3 = Graph.restrict (not o member (op =) names_hidden) program2;

    val names4 = Graph.all_succs program3 names2;

    val empty_funs = filter_out (member (op =) abortable)

      (Code_Thingol.empty_funs program3);

    val _ =

      if null empty_funs then ()

      else error ("No code equations for " ^

        commas (map (Proof_Context.extern_const ctxt) empty_funs));

    val program4 = Graph.restrict (member (op =) names4) program3;

  in (names4, program4) end;

fun prepare_serializer thy abortable (serializer : serializer) literals reserved module_alias

    printings module_name args naming proto_program names =

  let

    val (names_hidden, (const_syntax, tyco_syntax, class_syntax)) =

      activate_symbol_syntax thy literals naming printings;

    val (names_all, program) = project_program thy abortable names_hidden names proto_program;

    fun select_include (name, (content, cs)) =

      if null cs orelse exists (fn c => case Code_Thingol.lookup_const naming c

       of SOME name => member (op =) names_all name

        | NONE => false) cs

      then SOME (name, content) else NONE;

    val includes = map_filter select_include (Code_Symbol.dest_module_data printings);

  in

    (serializer args {

      labelled_name = Code_Thingol.labelled_name thy proto_program,

      reserved_syms = reserved,

      includes = includes,

      module_alias = if module_name = "" then Symtab.lookup module_alias else K (SOME module_name),

      const_syntax = Symtab.lookup const_syntax,

      tyco_syntax = Symtab.lookup tyco_syntax,

      class_syntax = Symtab.lookup class_syntax },

      program)

  end;

fun mount_serializer thy target some_width module_name args naming program names =

  let

    val (default_width, abortable, data, modify) = activate_target thy target;

    val serializer = case the_description data

     of Fundamental seri => #serializer seri;

    val reserved = the_reserved data;

    val module_alias = the_module_alias data

    val literals = the_literals thy target;

    val (prepared_serializer, prepared_program) = prepare_serializer thy

      abortable serializer literals reserved module_alias (the_printings data)

        module_name args naming (modify naming program) names

    val width = the_default default_width some_width;

  in (fn program => prepared_serializer program width, prepared_program) end;

fun invoke_serializer thy target some_width module_name args naming program names =

  let

    val (mounted_serializer, prepared_program) = mount_serializer thy

      target some_width module_name args naming program names;

  in mounted_serializer prepared_program end;

fun assert_module_name "" = error ("Empty module name not allowed.")

  | assert_module_name module_name = module_name;

fun using_master_directory thy =

  Option.map (Path.append (File.pwd ()) o Path.append (Thy_Load.master_directory thy));

in

val generatedN = "Generated_Code";

fun export_code_for thy some_path target some_width module_name args =

  export (using_master_directory thy some_path)

  ooo invoke_serializer thy target some_width module_name args;

fun produce_code_for thy target some_width module_name args =

  let

    val serializer = invoke_serializer thy target some_width (assert_module_name module_name) args;

  in fn naming => fn program => fn names =>

    produce (serializer naming program names) |> apsnd (fn deresolve => map deresolve names)

  end;

fun present_code_for thy target some_width module_name args =

  let

    val serializer = invoke_serializer thy target some_width (assert_module_name module_name) args;

  in fn naming => fn program => fn (names, selects) =>

    present selects (serializer naming program names)

  end;

fun check_code_for thy target strict args naming program names_cs =

  let

    val { env_var, make_destination, make_command } =

      (#check o the_fundamental thy) target;

    fun ext_check p =

      let

        val destination = make_destination p;

        val _ = export (SOME destination) (invoke_serializer thy target (SOME 80)

          generatedN args naming program names_cs);

        val cmd = make_command generatedN;

      in

        if Isabelle_System.bash ("cd " ^ File.shell_path p ^ " && " ^ cmd ^ " 2>&1") <> 0

        then error ("Code check failed for " ^ target ^ ": " ^ cmd)

        else ()

      end;

  in

    if getenv env_var = ""

    then if strict

      then error (env_var ^ " not set; cannot check code for " ^ target)

      else warning (env_var ^ " not set; skipped checking code for " ^ target)

    else Isabelle_System.with_tmp_dir "Code_Test" ext_check

  end;

fun evaluation mounted_serializer prepared_program consts ((vs, ty), t) =

  let

    val _ = if Code_Thingol.contains_dict_var t then

      error "Term to be evaluated contains free dictionaries" else ();

    val v' = singleton (Name.variant_list (map fst vs)) "a";

    val vs' = (v', []) :: vs;

    val ty' = Code_Thingol.fun_tyco `%% [ITyVar v', ty];

    val value_name = "Value.value.value"

    val program = prepared_program

      |> Graph.new_node (value_name,

          Code_Thingol.Fun (Term.dummy_patternN, (((vs', ty'), [(([IVar NONE], t), (NONE, true))]), NONE)))

      |> fold (curry (perhaps o try o Graph.add_edge) value_name) consts;

    val (program_code, deresolve) = produce (mounted_serializer program);

    val value_name' = the (deresolve value_name);

  in (program_code, value_name') end;

fun evaluator thy target naming program consts =

  let

    val (mounted_serializer, prepared_program) = mount_serializer thy

      target NONE generatedN [] naming program consts;

  in evaluation mounted_serializer prepared_program consts end;

end; (* local *)

(* code generation *)

fun transitivly_non_empty_funs thy naming program =

  let

    val cs = subtract (op =) (abort_allowed thy) (Code_Thingol.empty_funs program);

    val names = map_filter (Code_Thingol.lookup_const naming) cs;

  in subtract (op =) (Graph.all_preds program names) (Graph.keys program) end;

fun read_const_exprs thy cs =

  let

    val (cs1, cs2) = Code_Thingol.read_const_exprs thy cs;

    val (names2, (naming, program)) = Code_Thingol.consts_program thy true cs2;

    val names3 = transitivly_non_empty_funs thy naming program;

    val cs3 = map_filter (fn (c, name) =>

      if member (op =) names3 name then SOME c else NONE) (cs2 ~~ names2);

  in union (op =) cs3 cs1 end;

fun prep_destination "" = NONE

  | prep_destination "-" = NONE

  | prep_destination s = SOME (Path.explode s);

fun export_code thy cs seris =

  let

    val (names_cs, (naming, program)) = Code_Thingol.consts_program thy false cs;

    val _ = map (fn (((target, module_name), some_path), args) =>

      export_code_for thy some_path target NONE module_name args naming program names_cs) seris;

  in () end;

fun export_code_cmd raw_cs seris thy = export_code thy (read_const_exprs thy raw_cs)

  ((map o apfst o apsnd) prep_destination seris);

fun produce_code thy cs target some_width some_module_name args =

  let

    val (names_cs, (naming, program)) = Code_Thingol.consts_program thy false cs;

  in produce_code_for thy target some_width some_module_name args naming program names_cs end;

fun present_code thy cs names_stmt target some_width some_module_name args =

  let

    val (names_cs, (naming, program)) = Code_Thingol.consts_program thy false cs;

  in present_code_for thy target some_width some_module_name args naming program (names_cs, names_stmt naming) end;

fun check_code thy cs seris =

  let

    val (names_cs, (naming, program)) = Code_Thingol.consts_program thy false cs;

    val _ = map (fn ((target, strict), args) =>

      check_code_for thy target strict args naming program names_cs) seris;

  in () end;

fun check_code_cmd raw_cs seris thy = check_code thy (read_const_exprs thy raw_cs) seris;

local

val parse_const_terms = Scan.repeat1 Args.term

  >> (fn ts => fn thy => map (Code.check_const thy) ts);

fun parse_names category parse internalize lookup =

  Scan.lift (Args.parens (Args.$$$ category)) |-- Scan.repeat1 parse

  >> (fn xs => fn thy => fn naming => map_filter (lookup naming o internalize thy) xs);

val parse_consts = parse_names "consts" Args.term

  Code.check_const Code_Thingol.lookup_const ;

val parse_types = parse_names "types" (Scan.lift Args.name)

  Sign.intern_type Code_Thingol.lookup_tyco;

val parse_classes = parse_names "classes" (Scan.lift Args.name)

  Sign.intern_class Code_Thingol.lookup_class;

val parse_instances = parse_names "instances" (Scan.lift (Args.name --| Args.$$$ "::" -- Args.name))

  (fn thy => fn (raw_tyco, raw_class) => (Sign.intern_class thy raw_class, Sign.intern_type thy raw_tyco))

    Code_Thingol.lookup_instance;

in

val antiq_setup =

  Thy_Output.antiquotation @{binding code_stmts}

    (parse_const_terms --

      Scan.repeat (parse_consts || parse_types || parse_classes || parse_instances)

      -- Scan.lift (Args.parens (Args.name -- Scan.option Parse.int)))

    (fn {context = ctxt, ...} => fn ((mk_cs, mk_stmtss), (target, some_width)) =>

      let val thy = Proof_Context.theory_of ctxt in

        present_code thy (mk_cs thy)

          (fn naming => maps (fn f => f thy naming) mk_stmtss)

          target some_width "Example" []

      end);

end;

(** serializer configuration **)

(* checking and parsing *)

fun cert_const thy const =

  let

    val _ = if Sign.declared_const thy const then ()

      else error ("No such constant: " ^ quote const);

  in const end;

fun cert_tyco thy tyco =

  let

    val _ = if Sign.declared_tyname thy tyco then ()

      else error ("No such type constructor: " ^ quote tyco);

  in tyco end;

fun read_tyco thy = cert_tyco thy o Sign.intern_type thy;

fun cert_class thy class =

  let

    val _ = Axclass.get_info thy class;

  in class end;

fun read_class thy = cert_class thy o Sign.intern_class thy;

val parse_classrel_ident = Parse.class --| @{keyword "<"} -- Parse.class;

fun cert_inst thy (class, tyco) =

  (cert_class thy class, cert_tyco thy tyco);

fun read_inst thy (raw_tyco, raw_class) =

  (read_class thy raw_class, read_tyco thy raw_tyco);

val parse_inst_ident = Parse.xname --| @{keyword "::"} -- Parse.class;

fun cert_syms thy =

  Code_Symbol.map_attr (apfst (cert_const thy)) (apfst (cert_tyco thy))

    (apfst (cert_class thy)) ((apfst o pairself) (cert_class thy)) (apfst (cert_inst thy)) I;

fun read_syms thy =

  Code_Symbol.map_attr (apfst (Code.read_const thy)) (apfst (read_tyco thy))

    (apfst (read_class thy)) ((apfst o pairself) (read_class thy)) (apfst (read_inst thy)) I;

fun check_const_syntax thy c syn =

  if Code_Printer.requires_args syn > Code.args_number thy c

  then error ("Too many arguments in syntax for constant " ^ quote c)

  else syn;

fun check_tyco_syntax thy tyco syn =

  if fst syn <> Sign.arity_number thy tyco

  then error ("Number of arguments mismatch in syntax for type constructor " ^ quote tyco)

  else syn;

fun arrange_printings prep_const thy =

  let

    fun arrange check (sym, target_syns) =

      map (fn (target, some_syn) => (target, (sym, Option.map (check thy sym) some_syn))) target_syns;

  in

    Code_Symbol.maps_attr'

      (arrange check_const_syntax) (arrange check_tyco_syntax)

        (arrange ((K o K) I)) (arrange ((K o K) I)) (arrange ((K o K) I))

        (arrange (fn thy => fn _ => fn (raw_content, raw_cs) =>

          (Code_Printer.str raw_content, map (prep_const thy) raw_cs)))

  end;

fun cert_printings thy = cert_syms thy #> arrange_printings cert_const thy;

fun read_printings thy = read_syms thy #> arrange_printings Code.read_const thy;

(* custom symbol names *)

fun add_module_alias target (thyname, "") =

      map_module_alias target (Symtab.delete thyname)

  | add_module_alias target (thyname, modlname) =

      let

        val xs = Long_Name.explode modlname;

        val xs' = map (Name.desymbolize true) xs;

      in if xs' = xs

        then map_module_alias target (Symtab.update (thyname, modlname))

        else error ("Invalid module name: " ^ quote modlname ^ "\n"

          ^ "perhaps try " ^ quote (Long_Name.implode xs'))

      end;

fun add_reserved target sym thy =

  let

    val (_, data) = collapse_hierarchy thy target;

    val _ = if member (op =) (the_reserved data) sym

      then error ("Reserved symbol " ^ quote sym ^ " already declared")

      else ();

  in

    thy

    |> map_reserved target (insert (op =) sym)

  end;

(* custom printings *)

fun set_printing (target, sym_syn) = map_printings target (Code_Symbol.set_data sym_syn);

fun gen_set_printings prep_print_decl raw_print_decls thy =

  fold set_printing (prep_print_decl thy raw_print_decls) thy;

val set_printings = gen_set_printings cert_printings;

val set_printings_cmd = gen_set_printings read_printings;

fun gen_add_syntax Symbol prep_x prep_syn target raw_x some_raw_syn thy =

  let

    val x = prep_x thy raw_x;

  in set_printing (target, Symbol (x, Option.map (prep_syn thy x) some_raw_syn)) thy end;

fun gen_add_const_syntax prep_const =

  gen_add_syntax Code_Symbol.Constant prep_const check_const_syntax;

fun gen_add_tyco_syntax prep_tyco =

  gen_add_syntax Code_Symbol.Type_Constructor prep_tyco check_tyco_syntax;

fun gen_add_class_syntax prep_class =

  gen_add_syntax Code_Symbol.Type_Class prep_class ((K o K) I);

fun gen_add_instance_syntax prep_inst =

  gen_add_syntax Code_Symbol.Class_Instance prep_inst ((K o K) I);

fun gen_add_include prep_const target (name, some_content) thy =

  gen_add_syntax Code_Symbol.Module (K I)

    (fn thy => fn _ => fn (raw_content, raw_cs) => (Code_Printer.str raw_content, map (prep_const thy) raw_cs))

    target name some_content thy;

(* abortable constants *)

fun gen_allow_abort prep_const raw_c thy =

  let

    val c = prep_const thy raw_c;

  in thy |> (Targets.map o apfst o apsnd) (insert (op =) c) end;

(* concrete syntax *)

local

fun zip_list (x :: xs) f g =

  f

  :|-- (fn y =>

    fold_map (fn x => g |-- f >> pair x) xs

    :|-- (fn xys => pair ((x, y) :: xys)));

fun process_multi_syntax parse_thing parse_syntax change =

  (Parse.and_list1 parse_thing

  :|-- (fn things => Scan.repeat1 (@{keyword "("} |-- Parse.name --

        (zip_list things (Scan.option parse_syntax) @{keyword "and"}) --| @{keyword ")"})))

  >> (Toplevel.theory oo fold)

    (fn (target, syns) => fold (fn (raw_x, syn) => change target raw_x syn) syns);

in

val add_reserved = add_reserved;

val add_const_syntax = gen_add_const_syntax (K I);

val add_tyco_syntax = gen_add_tyco_syntax cert_tyco;

val add_class_syntax = gen_add_class_syntax cert_class;

val add_instance_syntax = gen_add_instance_syntax cert_inst;

val add_include = gen_add_include (K I);

val allow_abort = gen_allow_abort (K I);

val add_const_syntax_cmd = gen_add_const_syntax Code.read_const;

val add_tyco_syntax_cmd = gen_add_tyco_syntax read_tyco;

val add_class_syntax_cmd = gen_add_class_syntax read_class;

val add_instance_syntax_cmd = gen_add_instance_syntax read_inst;

val add_include_cmd = gen_add_include Code.read_const;

val allow_abort_cmd = gen_allow_abort Code.read_const;

fun parse_args f args =

  case Scan.read Token.stopper f args

   of SOME x => x

    | NONE => error "Bad serializer arguments";

(** Isar setup **)

val code_expr_argsP = Scan.optional (@{keyword "("} |-- Args.parse --| @{keyword ")"}) [];

val code_exprP =

  Scan.repeat1 Parse.term_group :|-- (fn raw_cs =>

    ((@{keyword "checking"} |-- Scan.repeat (Parse.name

      -- ((@{keyword "?"} |-- Scan.succeed false) || Scan.succeed true) -- code_expr_argsP))

      >> (fn seris => check_code_cmd raw_cs seris)

    || Scan.repeat (@{keyword "in"} |-- Parse.name

       -- Scan.optional (@{keyword "module_name"} |-- Parse.name) ""

       -- Scan.optional (@{keyword "file"} |-- Parse.name) ""

       -- code_expr_argsP) >> (fn seris => export_code_cmd raw_cs seris)));

fun parse_single_symbol_pragma parse_keyword parse_isa parse_target =

  parse_keyword |-- Parse.!!! parse_isa --| (@{keyword "\<rightharpoonup>"} || @{keyword "=>"})

    -- Parse.and_list1 (@{keyword "("} |-- (Parse.name --| @{keyword ")"} -- Scan.option parse_target));

fun parse_symbol_pragma parse_const parse_tyco parse_class parse_classrel parse_inst parse_module =

  parse_single_symbol_pragma @{keyword "constant"} Parse.term_group parse_const

    >> Code_Symbol.Constant

  || parse_single_symbol_pragma @{keyword "type_constructor"} Parse.xname parse_tyco

    >> Code_Symbol.Type_Constructor

  || parse_single_symbol_pragma @{keyword "type_class"} Parse.xname parse_class

    >> Code_Symbol.Type_Class

  || parse_single_symbol_pragma @{keyword "class_relation"} parse_classrel_ident parse_classrel

    >> Code_Symbol.Class_Relation

  || parse_single_symbol_pragma @{keyword "class_instance"} parse_inst_ident parse_inst

    >> Code_Symbol.Class_Instance

  || parse_single_symbol_pragma @{keyword "code_module"} Parse.name parse_module

    >> Code_Symbol.Module;

fun parse_symbol_pragmas parse_const parse_tyco parse_class parse_classrel parse_inst parse_module =

  Parse.enum1 "|" (Parse.group (fn () => "code symbol pragma")

    (parse_symbol_pragma parse_const parse_tyco parse_class parse_classrel parse_inst parse_module));

val _ =

  Outer_Syntax.command @{command_spec "code_printing"} "declare dedicated printing for code symbols"

    (parse_symbol_pragmas (Code_Printer.parse_const_syntax) (Code_Printer.parse_tyco_syntax)

      Parse.string (Parse.minus >> K ()) (Parse.minus >> K ())

      (Parse.text -- Scan.optional (@{keyword "attach"} |-- Scan.repeat1 Parse.term) [])

      >> (Toplevel.theory o fold set_printings_cmd));

val _ =

  Outer_Syntax.command @{command_spec "code_const"} "define code syntax for constant"

    (process_multi_syntax Parse.term_group Code_Printer.parse_const_syntax

      add_const_syntax_cmd);

val _ =

  Outer_Syntax.command @{command_spec "code_type"} "define code syntax for type constructor"

    (process_multi_syntax Parse.xname Code_Printer.parse_tyco_syntax

      add_tyco_syntax_cmd);

val _ =

  Outer_Syntax.command @{command_spec "code_class"} "define code syntax for class"

    (process_multi_syntax Parse.xname Parse.string

      add_class_syntax_cmd);

val _ =

  Outer_Syntax.command @{command_spec "code_instance"} "define code syntax for instance"

    (process_multi_syntax (Parse.xname --| @{keyword "::"} -- Parse.xname) (Parse.minus >> K ())

      add_instance_syntax_cmd);

val _ =

  Outer_Syntax.command @{command_spec "code_reserved"}

    "declare words as reserved for target language"

    (Parse.name -- Scan.repeat1 Parse.name

      >> (fn (target, reserveds) => (Toplevel.theory o fold (add_reserved target)) reserveds));

val _ =

  Outer_Syntax.command @{command_spec "code_include"}

    "declare piece of code to be included in generated code"

    (Parse.name -- Parse.name -- (Parse.text :|--

      (fn "-" => Scan.succeed NONE

        | s => Scan.optional (@{keyword "attach"} |-- Scan.repeat1 Parse.term) [] >> pair s >> SOME))

      >> (fn ((target, name), content_consts) =>

          (Toplevel.theory o add_include_cmd target) (name, content_consts)));

val _ =

  Outer_Syntax.command @{command_spec "code_modulename"} "alias module to other name"

    (Parse.name -- Scan.repeat1 (Parse.name -- Parse.name)

      >> (fn (target, modlnames) => (Toplevel.theory o fold (add_module_alias target)) modlnames));

val _ =

  Outer_Syntax.command @{command_spec "code_abort"}

    "permit constant to be implemented as program abort"

    (Scan.repeat1 Parse.term_group >> (Toplevel.theory o fold allow_abort_cmd));

val _ =

  Outer_Syntax.command @{command_spec "export_code"} "generate executable code for constants"

    (Parse.!!! code_exprP >> (fn f => Toplevel.keep (f o Toplevel.theory_of)));

end; (*local*)

(** external entrance point -- for codegen tool **)

fun codegen_tool thyname cmd_expr =

  let

    val thy = Thy_Info.get_theory thyname;

    val parse = Scan.read Token.stopper (Parse.!!! code_exprP) o

      (filter Token.is_proper o Outer_Syntax.scan Position.none);

  in case parse cmd_expr

   of SOME f => (writeln "Now generating code..."; f thy)

    | NONE => error ("Bad directive " ^ quote cmd_expr)

  end;

(** theory setup **)

val setup = antiq_setup;

end; (*struct*)